We are selling our Britax Marathon 70 convertible car seat. It’s designed for children from 5 to 40 pounds rear facing and up to 70 pounds forward facing. It’s a very safe seat featuring “SafeCell Technology,” integrated steel bars, Versa-Tether, and “Britax Side Impact Protection.” It’s in excellent condition, has never been in any accident, and has always been used in a smoke- and pet-free car.

We live in central Menlo Park, close to Santa Cruz Avenue.